blob: 6ee8410443c46312ca62810199dc14ffbaf53966 [file] [log] [blame]
Rusty Russell48925e32009-09-24 09:59:20 -06001/* A network driver using virtio.
Rusty Russell296f96f2007-10-22 11:03:37 +10002 *
3 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19//#define DEBUG
20#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
Herbert Xua9ea3fc2008-04-18 11:21:42 +080022#include <linux/ethtool.h>
Rusty Russell296f96f2007-10-22 11:03:37 +100023#include <linux/module.h>
24#include <linux/virtio.h>
25#include <linux/virtio_net.h>
26#include <linux/scatterlist.h>
Alex Williamsone918085a2009-01-25 18:06:26 -080027#include <linux/if_vlan.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Rusty Russell296f96f2007-10-22 11:03:37 +100029
Dor Laor6c0cd7c2007-12-16 15:19:43 +020030static int napi_weight = 128;
31module_param(napi_weight, int, 0444);
32
Rusty Russell34a48572008-02-04 23:50:02 -050033static int csum = 1, gso = 1;
34module_param(csum, bool, 0444);
35module_param(gso, bool, 0444);
36
Rusty Russell296f96f2007-10-22 11:03:37 +100037/* FIXME: MTU in config. */
Alex Williamsone918085a2009-01-25 18:06:26 -080038#define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -080039#define GOOD_COPY_LEN 128
Rusty Russell296f96f2007-10-22 11:03:37 +100040
Alex Williamsonf565a7c2009-02-04 09:02:45 +000041#define VIRTNET_SEND_COMMAND_SG_MAX 2
Alex Williamson2a41f712009-02-04 09:02:34 +000042
stephen hemminger3fa2a1d2011-06-15 06:36:29 +000043struct virtnet_stats {
44 struct u64_stats_sync syncp;
45 u64 tx_bytes;
46 u64 tx_packets;
47
48 u64 rx_bytes;
49 u64 rx_packets;
50};
51
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -070052struct virtnet_info {
Rusty Russell296f96f2007-10-22 11:03:37 +100053 struct virtio_device *vdev;
Alex Williamson2a41f712009-02-04 09:02:34 +000054 struct virtqueue *rvq, *svq, *cvq;
Rusty Russell296f96f2007-10-22 11:03:37 +100055 struct net_device *dev;
56 struct napi_struct napi;
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -080057 unsigned int status;
Rusty Russell296f96f2007-10-22 11:03:37 +100058
59 /* Number of input buffers, and max we've ever had. */
60 unsigned int num, max;
61
Herbert Xu97402b92008-04-18 11:24:27 +080062 /* I like... big packets and I cannot lie! */
63 bool big_packets;
64
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -080065 /* Host will merge rx buffers for big packets (shake it! shake it!) */
66 bool mergeable_rx_bufs;
67
stephen hemminger3fa2a1d2011-06-15 06:36:29 +000068 /* Active statistics */
69 struct virtnet_stats __percpu *stats;
70
Rusty Russell3161e452009-08-26 12:22:32 -070071 /* Work struct for refilling if we run low on memory. */
72 struct delayed_work refill;
73
Rusty Russellfb6813f2008-07-25 12:06:01 -050074 /* Chain pages by the private ptr. */
75 struct page *pages;
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -070076
77 /* fragments + linear part + virtio header */
78 struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
79 struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
Rusty Russell296f96f2007-10-22 11:03:37 +100080};
81
Rusty Russellb3f24692009-09-24 09:59:19 -060082struct skb_vnet_hdr {
83 union {
84 struct virtio_net_hdr hdr;
85 struct virtio_net_hdr_mrg_rxbuf mhdr;
86 };
Rusty Russell48925e32009-09-24 09:59:20 -060087 unsigned int num_sg;
Rusty Russellb3f24692009-09-24 09:59:19 -060088};
89
Shirley Ma9ab86bb2010-01-29 03:20:04 +000090struct padded_vnet_hdr {
91 struct virtio_net_hdr hdr;
92 /*
93 * virtio_net_hdr should be in a separated sg buffer because of a
94 * QEMU bug, and data sg buffer shares same page with this header sg.
95 * This padding makes next sg 16 byte aligned after virtio_net_hdr.
96 */
97 char padding[6];
98};
99
Rusty Russellb3f24692009-09-24 09:59:19 -0600100static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
Rusty Russell296f96f2007-10-22 11:03:37 +1000101{
Rusty Russellb3f24692009-09-24 09:59:19 -0600102 return (struct skb_vnet_hdr *)skb->cb;
Rusty Russell296f96f2007-10-22 11:03:37 +1000103}
104
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000105/*
106 * private is used to chain pages for big packets, put the whole
107 * most recent used list in the beginning for reuse
108 */
109static void give_pages(struct virtnet_info *vi, struct page *page)
Rusty Russellfb6813f2008-07-25 12:06:01 -0500110{
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000111 struct page *end;
112
113 /* Find end of list, sew whole thing into vi->pages. */
114 for (end = page; end->private; end = (struct page *)end->private);
115 end->private = (unsigned long)vi->pages;
Rusty Russellfb6813f2008-07-25 12:06:01 -0500116 vi->pages = page;
117}
118
119static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
120{
121 struct page *p = vi->pages;
122
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000123 if (p) {
Rusty Russellfb6813f2008-07-25 12:06:01 -0500124 vi->pages = (struct page *)p->private;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000125 /* clear private here, it is used to chain pages */
126 p->private = 0;
127 } else
Rusty Russellfb6813f2008-07-25 12:06:01 -0500128 p = alloc_page(gfp_mask);
129 return p;
130}
131
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500132static void skb_xmit_done(struct virtqueue *svq)
Rusty Russell296f96f2007-10-22 11:03:37 +1000133{
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500134 struct virtnet_info *vi = svq->vdev->priv;
Rusty Russell296f96f2007-10-22 11:03:37 +1000135
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500136 /* Suppress further interrupts. */
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300137 virtqueue_disable_cb(svq);
Rusty Russell11a3a152008-05-26 17:48:13 +1000138
Rusty Russell363f1512008-06-08 20:51:55 +1000139 /* We were probably waiting for more output buffers. */
Rusty Russell296f96f2007-10-22 11:03:37 +1000140 netif_wake_queue(vi->dev);
Rusty Russell296f96f2007-10-22 11:03:37 +1000141}
142
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000143static void set_skb_frag(struct sk_buff *skb, struct page *page,
144 unsigned int offset, unsigned int *len)
145{
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000146 int size = min((unsigned)PAGE_SIZE - offset, *len);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000147 int i = skb_shinfo(skb)->nr_frags;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000148
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000149 __skb_fill_page_desc(skb, i, page, offset, size);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000150
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000151 skb->data_len += size;
152 skb->len += size;
Eric Dumazet4b727362011-10-19 23:14:46 +0000153 skb->truesize += PAGE_SIZE;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000154 skb_shinfo(skb)->nr_frags++;
Krishna Kumar8a59a7b2011-10-19 22:17:27 +0000155 *len -= size;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000156}
157
158static struct sk_buff *page_to_skb(struct virtnet_info *vi,
159 struct page *page, unsigned int len)
160{
161 struct sk_buff *skb;
162 struct skb_vnet_hdr *hdr;
163 unsigned int copy, hdr_len, offset;
164 char *p;
165
166 p = page_address(page);
167
168 /* copy small packet so we can reuse these pages for small data */
169 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
170 if (unlikely(!skb))
171 return NULL;
172
173 hdr = skb_vnet_hdr(skb);
174
175 if (vi->mergeable_rx_bufs) {
176 hdr_len = sizeof hdr->mhdr;
177 offset = hdr_len;
178 } else {
179 hdr_len = sizeof hdr->hdr;
180 offset = sizeof(struct padded_vnet_hdr);
181 }
182
183 memcpy(hdr, p, hdr_len);
184
185 len -= hdr_len;
186 p += offset;
187
188 copy = len;
189 if (copy > skb_tailroom(skb))
190 copy = skb_tailroom(skb);
191 memcpy(skb_put(skb, copy), p, copy);
192
193 len -= copy;
194 offset += copy;
195
Sasha Levine878d782011-09-28 04:40:54 +0000196 /*
197 * Verify that we can indeed put this data into a skb.
198 * This is here to handle cases when the device erroneously
199 * tries to receive more than is possible. This is usually
200 * the case of a broken device.
201 */
202 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
203 if (net_ratelimit())
204 pr_debug("%s: too much data\n", skb->dev->name);
205 dev_kfree_skb(skb);
206 return NULL;
207 }
208
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000209 while (len) {
210 set_skb_frag(skb, page, offset, &len);
211 page = (struct page *)page->private;
212 offset = 0;
213 }
214
215 if (page)
216 give_pages(vi, page);
217
218 return skb;
219}
220
221static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
222{
223 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
224 struct page *page;
225 int num_buf, i, len;
226
227 num_buf = hdr->mhdr.num_buffers;
228 while (--num_buf) {
229 i = skb_shinfo(skb)->nr_frags;
230 if (i >= MAX_SKB_FRAGS) {
231 pr_debug("%s: packet too long\n", skb->dev->name);
232 skb->dev->stats.rx_length_errors++;
233 return -EINVAL;
234 }
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300235 page = virtqueue_get_buf(vi->rvq, &len);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000236 if (!page) {
237 pr_debug("%s: rx error: %d buffers missing\n",
238 skb->dev->name, hdr->mhdr.num_buffers);
239 skb->dev->stats.rx_length_errors++;
240 return -EINVAL;
241 }
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000242
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000243 if (len > PAGE_SIZE)
244 len = PAGE_SIZE;
245
246 set_skb_frag(skb, page, 0, &len);
247
248 --vi->num;
249 }
250 return 0;
251}
252
253static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
Rusty Russell296f96f2007-10-22 11:03:37 +1000254{
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800255 struct virtnet_info *vi = netdev_priv(dev);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000256 struct virtnet_stats __percpu *stats = this_cpu_ptr(vi->stats);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000257 struct sk_buff *skb;
258 struct page *page;
259 struct skb_vnet_hdr *hdr;
Rusty Russell296f96f2007-10-22 11:03:37 +1000260
261 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
262 pr_debug("%s: short packet %i\n", dev->name, len);
263 dev->stats.rx_length_errors++;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000264 if (vi->mergeable_rx_bufs || vi->big_packets)
265 give_pages(vi, buf);
266 else
267 dev_kfree_skb(buf);
268 return;
Rusty Russell296f96f2007-10-22 11:03:37 +1000269 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000270
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000271 if (!vi->mergeable_rx_bufs && !vi->big_packets) {
272 skb = buf;
273 len -= sizeof(struct virtio_net_hdr);
274 skb_trim(skb, len);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800275 } else {
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000276 page = buf;
277 skb = page_to_skb(vi, page, len);
278 if (unlikely(!skb)) {
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800279 dev->stats.rx_dropped++;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000280 give_pages(vi, page);
281 return;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800282 }
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000283 if (vi->mergeable_rx_bufs)
284 if (receive_mergeable(vi, skb)) {
285 dev_kfree_skb(skb);
286 return;
287 }
Herbert Xu97402b92008-04-18 11:24:27 +0800288 }
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800289
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000290 hdr = skb_vnet_hdr(skb);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000291
292 u64_stats_update_begin(&stats->syncp);
293 stats->rx_bytes += skb->len;
294 stats->rx_packets++;
295 u64_stats_update_end(&stats->syncp);
Rusty Russell296f96f2007-10-22 11:03:37 +1000296
Rusty Russellb3f24692009-09-24 09:59:19 -0600297 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000298 pr_debug("Needs csum!\n");
Rusty Russellb3f24692009-09-24 09:59:19 -0600299 if (!skb_partial_csum_set(skb,
300 hdr->hdr.csum_start,
301 hdr->hdr.csum_offset))
Rusty Russell296f96f2007-10-22 11:03:37 +1000302 goto frame_err;
Jason Wang10a8d942011-06-10 00:56:17 +0000303 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
304 skb->ip_summed = CHECKSUM_UNNECESSARY;
Rusty Russell296f96f2007-10-22 11:03:37 +1000305 }
306
Mark McLoughlin23cde762008-06-08 20:49:00 +1000307 skb->protocol = eth_type_trans(skb, dev);
308 pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
309 ntohs(skb->protocol), skb->len, skb->pkt_type);
310
Rusty Russellb3f24692009-09-24 09:59:19 -0600311 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000312 pr_debug("GSO!\n");
Rusty Russellb3f24692009-09-24 09:59:19 -0600313 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000314 case VIRTIO_NET_HDR_GSO_TCPV4:
315 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
316 break;
Rusty Russell296f96f2007-10-22 11:03:37 +1000317 case VIRTIO_NET_HDR_GSO_UDP:
318 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
319 break;
320 case VIRTIO_NET_HDR_GSO_TCPV6:
321 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
322 break;
323 default:
324 if (net_ratelimit())
325 printk(KERN_WARNING "%s: bad gso type %u.\n",
Rusty Russellb3f24692009-09-24 09:59:19 -0600326 dev->name, hdr->hdr.gso_type);
Rusty Russell296f96f2007-10-22 11:03:37 +1000327 goto frame_err;
328 }
329
Rusty Russellb3f24692009-09-24 09:59:19 -0600330 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
Rusty Russell34a48572008-02-04 23:50:02 -0500331 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
332
Rusty Russellb3f24692009-09-24 09:59:19 -0600333 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
Rusty Russell296f96f2007-10-22 11:03:37 +1000334 if (skb_shinfo(skb)->gso_size == 0) {
335 if (net_ratelimit())
336 printk(KERN_WARNING "%s: zero gso size.\n",
337 dev->name);
338 goto frame_err;
339 }
340
341 /* Header must be checked, and gso_segs computed. */
342 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
343 skb_shinfo(skb)->gso_segs = 0;
344 }
345
346 netif_receive_skb(skb);
347 return;
348
349frame_err:
350 dev->stats.rx_frame_errors++;
Rusty Russell296f96f2007-10-22 11:03:37 +1000351 dev_kfree_skb(skb);
352}
353
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000354static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
Rusty Russell296f96f2007-10-22 11:03:37 +1000355{
356 struct sk_buff *skb;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000357 struct skb_vnet_hdr *hdr;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000358 int err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000359
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000360 skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
361 if (unlikely(!skb))
362 return -ENOMEM;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800363
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000364 skb_put(skb, MAX_PACKET_LEN);
365
366 hdr = skb_vnet_hdr(skb);
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700367 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000368
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700369 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000370
Michael S. Tsirkinaa989f52010-05-31 01:10:01 +0000371 err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000372 if (err < 0)
373 dev_kfree_skb(skb);
374
375 return err;
376}
377
378static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
379{
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000380 struct page *first, *list = NULL;
381 char *p;
382 int i, err, offset;
383
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700384 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000385 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
386 first = get_a_page(vi, gfp);
387 if (!first) {
388 if (list)
389 give_pages(vi, list);
390 return -ENOMEM;
Rusty Russell3161e452009-08-26 12:22:32 -0700391 }
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700392 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
Rusty Russell296f96f2007-10-22 11:03:37 +1000393
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000394 /* chain new page in list head to match sg */
395 first->private = (unsigned long)list;
396 list = first;
397 }
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800398
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000399 first = get_a_page(vi, gfp);
400 if (!first) {
401 give_pages(vi, list);
402 return -ENOMEM;
403 }
404 p = page_address(first);
Herbert Xu97402b92008-04-18 11:24:27 +0800405
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700406 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
407 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
408 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
Herbert Xu97402b92008-04-18 11:24:27 +0800409
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700410 /* vi->rx_sg[1] for data packet, from offset */
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000411 offset = sizeof(struct padded_vnet_hdr);
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700412 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
Herbert Xu97402b92008-04-18 11:24:27 +0800413
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000414 /* chain first in list head */
415 first->private = (unsigned long)list;
Michael S. Tsirkinaa989f52010-05-31 01:10:01 +0000416 err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
417 first, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000418 if (err < 0)
419 give_pages(vi, first);
Herbert Xu97402b92008-04-18 11:24:27 +0800420
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000421 return err;
422}
Herbert Xu97402b92008-04-18 11:24:27 +0800423
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000424static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
425{
426 struct page *page;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000427 int err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000428
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000429 page = get_a_page(vi, gfp);
430 if (!page)
431 return -ENOMEM;
432
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700433 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000434
Michael S. Tsirkinaa989f52010-05-31 01:10:01 +0000435 err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000436 if (err < 0)
437 give_pages(vi, page);
438
439 return err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000440}
441
Rusty Russell3161e452009-08-26 12:22:32 -0700442/* Returns false if we couldn't fill entirely (OOM). */
443static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800444{
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800445 int err;
Michael S. Tsirkin1788f492010-07-02 16:32:55 +0000446 bool oom;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800447
Amit Shah0aea51c2009-08-26 14:58:28 +0530448 do {
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000449 if (vi->mergeable_rx_bufs)
450 err = add_recvbuf_mergeable(vi, gfp);
451 else if (vi->big_packets)
452 err = add_recvbuf_big(vi, gfp);
453 else
454 err = add_recvbuf_small(vi, gfp);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800455
Michael S. Tsirkin1788f492010-07-02 16:32:55 +0000456 oom = err == -ENOMEM;
457 if (err < 0)
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800458 break;
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000459 ++vi->num;
Amit Shah0aea51c2009-08-26 14:58:28 +0530460 } while (err > 0);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800461 if (unlikely(vi->num > vi->max))
462 vi->max = vi->num;
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300463 virtqueue_kick(vi->rvq);
Rusty Russell3161e452009-08-26 12:22:32 -0700464 return !oom;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800465}
466
Rusty Russell18445c42008-02-04 23:49:57 -0500467static void skb_recv_done(struct virtqueue *rvq)
Rusty Russell296f96f2007-10-22 11:03:37 +1000468{
469 struct virtnet_info *vi = rvq->vdev->priv;
Rusty Russell18445c42008-02-04 23:49:57 -0500470 /* Schedule NAPI, Suppress further interrupts if successful. */
Ben Hutchings288379f2009-01-19 16:43:59 -0800471 if (napi_schedule_prep(&vi->napi)) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300472 virtqueue_disable_cb(rvq);
Ben Hutchings288379f2009-01-19 16:43:59 -0800473 __napi_schedule(&vi->napi);
Rusty Russell18445c42008-02-04 23:49:57 -0500474 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000475}
476
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800477static void virtnet_napi_enable(struct virtnet_info *vi)
478{
479 napi_enable(&vi->napi);
480
481 /* If all buffers were filled by other side before we napi_enabled, we
482 * won't get another interrupt, so process any outstanding packets
483 * now. virtnet_poll wants re-enable the queue, so we disable here.
484 * We synchronize against interrupts via NAPI_STATE_SCHED */
485 if (napi_schedule_prep(&vi->napi)) {
486 virtqueue_disable_cb(vi->rvq);
487 __napi_schedule(&vi->napi);
488 }
489}
490
Rusty Russell3161e452009-08-26 12:22:32 -0700491static void refill_work(struct work_struct *work)
492{
493 struct virtnet_info *vi;
494 bool still_empty;
495
496 vi = container_of(work, struct virtnet_info, refill.work);
497 napi_disable(&vi->napi);
Herbert Xu39d32152010-01-25 15:51:01 -0800498 still_empty = !try_fill_recv(vi, GFP_KERNEL);
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800499 virtnet_napi_enable(vi);
Rusty Russell3161e452009-08-26 12:22:32 -0700500
501 /* In theory, this can happen: if we don't get any buffers in
502 * we will *never* try to fill again. */
503 if (still_empty)
504 schedule_delayed_work(&vi->refill, HZ/2);
505}
506
Rusty Russell296f96f2007-10-22 11:03:37 +1000507static int virtnet_poll(struct napi_struct *napi, int budget)
508{
509 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000510 void *buf;
Rusty Russell296f96f2007-10-22 11:03:37 +1000511 unsigned int len, received = 0;
512
513again:
514 while (received < budget &&
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300515 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
Shirley Ma9ab86bb2010-01-29 03:20:04 +0000516 receive_buf(vi->dev, buf, len);
517 --vi->num;
Rusty Russell296f96f2007-10-22 11:03:37 +1000518 received++;
519 }
520
Rusty Russell3161e452009-08-26 12:22:32 -0700521 if (vi->num < vi->max / 2) {
522 if (!try_fill_recv(vi, GFP_ATOMIC))
523 schedule_delayed_work(&vi->refill, 0);
524 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000525
Rusty Russell8329d982007-11-19 11:20:43 -0500526 /* Out of packets? */
527 if (received < budget) {
Ben Hutchings288379f2009-01-19 16:43:59 -0800528 napi_complete(napi);
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300529 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
Joe Perches8e95a202009-12-03 07:58:21 +0000530 napi_schedule_prep(napi)) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300531 virtqueue_disable_cb(vi->rvq);
Ben Hutchings288379f2009-01-19 16:43:59 -0800532 __napi_schedule(napi);
Rusty Russell296f96f2007-10-22 11:03:37 +1000533 goto again;
Christian Borntraeger4265f162008-03-14 14:17:05 +0100534 }
Rusty Russell296f96f2007-10-22 11:03:37 +1000535 }
536
537 return received;
538}
539
Rusty Russell48925e32009-09-24 09:59:20 -0600540static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
Rusty Russell296f96f2007-10-22 11:03:37 +1000541{
542 struct sk_buff *skb;
Rusty Russell48925e32009-09-24 09:59:20 -0600543 unsigned int len, tot_sgs = 0;
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000544 struct virtnet_stats __percpu *stats = this_cpu_ptr(vi->stats);
Rusty Russell296f96f2007-10-22 11:03:37 +1000545
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300546 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000547 pr_debug("Sent skb %p\n", skb);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000548
549 u64_stats_update_begin(&stats->syncp);
550 stats->tx_bytes += skb->len;
551 stats->tx_packets++;
552 u64_stats_update_end(&stats->syncp);
553
Rusty Russell48925e32009-09-24 09:59:20 -0600554 tot_sgs += skb_vnet_hdr(skb)->num_sg;
Eric Dumazeted79bab2009-10-14 14:36:43 +0000555 dev_kfree_skb_any(skb);
Rusty Russell296f96f2007-10-22 11:03:37 +1000556 }
Rusty Russell48925e32009-09-24 09:59:20 -0600557 return tot_sgs;
Rusty Russell296f96f2007-10-22 11:03:37 +1000558}
559
Rusty Russell99ffc692008-05-02 21:50:46 -0500560static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
Rusty Russell296f96f2007-10-22 11:03:37 +1000561{
Rusty Russellb3f24692009-09-24 09:59:19 -0600562 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
Rusty Russell296f96f2007-10-22 11:03:37 +1000563 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
Rusty Russell296f96f2007-10-22 11:03:37 +1000564
Johannes Berge1749612008-10-27 15:59:26 -0700565 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
Rusty Russell296f96f2007-10-22 11:03:37 +1000566
Rusty Russell296f96f2007-10-22 11:03:37 +1000567 if (skb->ip_summed == CHECKSUM_PARTIAL) {
Rusty Russellb3f24692009-09-24 09:59:19 -0600568 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
Michał Mirosław55508d62010-12-14 15:24:08 +0000569 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
Rusty Russellb3f24692009-09-24 09:59:19 -0600570 hdr->hdr.csum_offset = skb->csum_offset;
Rusty Russell296f96f2007-10-22 11:03:37 +1000571 } else {
Rusty Russellb3f24692009-09-24 09:59:19 -0600572 hdr->hdr.flags = 0;
573 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
Rusty Russell296f96f2007-10-22 11:03:37 +1000574 }
575
576 if (skb_is_gso(skb)) {
Rusty Russellb3f24692009-09-24 09:59:19 -0600577 hdr->hdr.hdr_len = skb_headlen(skb);
578 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
Rusty Russell34a48572008-02-04 23:50:02 -0500579 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
Rusty Russellb3f24692009-09-24 09:59:19 -0600580 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
Rusty Russell296f96f2007-10-22 11:03:37 +1000581 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
Rusty Russellb3f24692009-09-24 09:59:19 -0600582 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
Rusty Russell296f96f2007-10-22 11:03:37 +1000583 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
Rusty Russellb3f24692009-09-24 09:59:19 -0600584 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
Rusty Russell296f96f2007-10-22 11:03:37 +1000585 else
586 BUG();
Rusty Russell34a48572008-02-04 23:50:02 -0500587 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
Rusty Russellb3f24692009-09-24 09:59:19 -0600588 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
Rusty Russell296f96f2007-10-22 11:03:37 +1000589 } else {
Rusty Russellb3f24692009-09-24 09:59:19 -0600590 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
591 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
Rusty Russell296f96f2007-10-22 11:03:37 +1000592 }
593
Rusty Russellb3f24692009-09-24 09:59:19 -0600594 hdr->mhdr.num_buffers = 0;
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800595
596 /* Encode metadata header at front. */
597 if (vi->mergeable_rx_bufs)
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700598 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800599 else
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700600 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -0800601
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700602 hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
Linus Torvalds1756ac32010-05-21 17:22:52 -0700603 return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -0700604 0, skb);
Rusty Russell11a3a152008-05-26 17:48:13 +1000605}
606
Stephen Hemminger424efe92009-08-31 19:50:51 +0000607static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
Rusty Russell99ffc692008-05-02 21:50:46 -0500608{
609 struct virtnet_info *vi = netdev_priv(dev);
Rusty Russell48925e32009-09-24 09:59:20 -0600610 int capacity;
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500611
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500612 /* Free up any pending old buffers before queueing new ones. */
613 free_old_xmit_skbs(vi);
Rusty Russell2cb9c6b2008-02-04 23:50:07 -0500614
Michael S. Tsirkin03f191b2009-10-28 04:03:38 -0700615 /* Try to transmit */
Rusty Russell48925e32009-09-24 09:59:20 -0600616 capacity = xmit_skb(vi, skb);
617
618 /* This can happen with OOM and indirect buffers. */
619 if (unlikely(capacity < 0)) {
Rusty Russell58eba972010-07-02 16:34:01 +0000620 if (net_ratelimit()) {
621 if (likely(capacity == -ENOMEM)) {
622 dev_warn(&dev->dev,
623 "TX queue failure: out of memory\n");
624 } else {
625 dev->stats.tx_fifo_errors++;
626 dev_warn(&dev->dev,
627 "Unexpected TX queue failure: %d\n",
628 capacity);
629 }
Rusty Russell48925e32009-09-24 09:59:20 -0600630 }
Rusty Russell58eba972010-07-02 16:34:01 +0000631 dev->stats.tx_dropped++;
632 kfree_skb(skb);
633 return NETDEV_TX_OK;
Rusty Russell99ffc692008-05-02 21:50:46 -0500634 }
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300635 virtqueue_kick(vi->svq);
Michael S. Tsirkin03f191b2009-10-28 04:03:38 -0700636
Rusty Russell48925e32009-09-24 09:59:20 -0600637 /* Don't wait up for transmitted skbs to be freed. */
638 skb_orphan(skb);
639 nf_reset(skb);
Rusty Russell99ffc692008-05-02 21:50:46 -0500640
Rusty Russell48925e32009-09-24 09:59:20 -0600641 /* Apparently nice girls don't return TX_BUSY; stop the queue
642 * before it gets out of hand. Naturally, this wastes entries. */
643 if (capacity < 2+MAX_SKB_FRAGS) {
644 netif_stop_queue(dev);
Michael S. Tsirkin7a66f782011-05-20 02:11:23 +0300645 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
Rusty Russell48925e32009-09-24 09:59:20 -0600646 /* More just got used, free them then recheck. */
647 capacity += free_old_xmit_skbs(vi);
648 if (capacity >= 2+MAX_SKB_FRAGS) {
649 netif_start_queue(dev);
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300650 virtqueue_disable_cb(vi->svq);
Rusty Russell48925e32009-09-24 09:59:20 -0600651 }
652 }
Rusty Russell99ffc692008-05-02 21:50:46 -0500653 }
Rusty Russell48925e32009-09-24 09:59:20 -0600654
655 return NETDEV_TX_OK;
Rusty Russell296f96f2007-10-22 11:03:37 +1000656}
657
Alex Williamson9c46f6d2009-02-04 16:36:34 -0800658static int virtnet_set_mac_address(struct net_device *dev, void *p)
659{
660 struct virtnet_info *vi = netdev_priv(dev);
661 struct virtio_device *vdev = vi->vdev;
662 int ret;
663
664 ret = eth_mac_addr(dev, p);
665 if (ret)
666 return ret;
667
Alex Williamson62994b22009-04-04 16:40:19 -0700668 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
669 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
670 dev->dev_addr, dev->addr_len);
Alex Williamson9c46f6d2009-02-04 16:36:34 -0800671
672 return 0;
673}
674
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000675static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
676 struct rtnl_link_stats64 *tot)
677{
678 struct virtnet_info *vi = netdev_priv(dev);
679 int cpu;
680 unsigned int start;
681
682 for_each_possible_cpu(cpu) {
683 struct virtnet_stats __percpu *stats
684 = per_cpu_ptr(vi->stats, cpu);
685 u64 tpackets, tbytes, rpackets, rbytes;
686
687 do {
688 start = u64_stats_fetch_begin(&stats->syncp);
689 tpackets = stats->tx_packets;
690 tbytes = stats->tx_bytes;
691 rpackets = stats->rx_packets;
692 rbytes = stats->rx_bytes;
693 } while (u64_stats_fetch_retry(&stats->syncp, start));
694
695 tot->rx_packets += rpackets;
696 tot->tx_packets += tpackets;
697 tot->rx_bytes += rbytes;
698 tot->tx_bytes += tbytes;
699 }
700
701 tot->tx_dropped = dev->stats.tx_dropped;
702 tot->rx_dropped = dev->stats.rx_dropped;
703 tot->rx_length_errors = dev->stats.rx_length_errors;
704 tot->rx_frame_errors = dev->stats.rx_frame_errors;
705
706 return tot;
707}
708
Amit Shahda74e892008-02-29 16:24:50 +0530709#ifdef CONFIG_NET_POLL_CONTROLLER
710static void virtnet_netpoll(struct net_device *dev)
711{
712 struct virtnet_info *vi = netdev_priv(dev);
713
714 napi_schedule(&vi->napi);
715}
716#endif
717
Rusty Russell296f96f2007-10-22 11:03:37 +1000718static int virtnet_open(struct net_device *dev)
719{
720 struct virtnet_info *vi = netdev_priv(dev);
721
Bruce Rogers3e9d08e2011-02-10 11:03:31 -0800722 virtnet_napi_enable(vi);
Rusty Russell296f96f2007-10-22 11:03:37 +1000723 return 0;
724}
725
Alex Williamson2a41f712009-02-04 09:02:34 +0000726/*
727 * Send command via the control virtqueue and check status. Commands
728 * supported by the hypervisor, as indicated by feature bits, should
729 * never fail unless improperly formated.
730 */
731static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
732 struct scatterlist *data, int out, int in)
733{
Alex Williamson23e258e2009-05-01 17:27:56 +0000734 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
Alex Williamson2a41f712009-02-04 09:02:34 +0000735 struct virtio_net_ctrl_hdr ctrl;
736 virtio_net_ctrl_ack status = ~0;
737 unsigned int tmp;
Alex Williamson23e258e2009-05-01 17:27:56 +0000738 int i;
Alex Williamson2a41f712009-02-04 09:02:34 +0000739
Alexander Beregalov0ee904c2009-04-11 14:50:23 +0000740 /* Caller should know better */
741 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
742 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
Alex Williamson2a41f712009-02-04 09:02:34 +0000743
744 out++; /* Add header */
745 in++; /* Add return status */
746
747 ctrl.class = class;
748 ctrl.cmd = cmd;
749
750 sg_init_table(sg, out + in);
751
752 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
Alex Williamson23e258e2009-05-01 17:27:56 +0000753 for_each_sg(data, s, out + in - 2, i)
754 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
Alex Williamson2a41f712009-02-04 09:02:34 +0000755 sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
756
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300757 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi) < 0);
Alex Williamson2a41f712009-02-04 09:02:34 +0000758
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300759 virtqueue_kick(vi->cvq);
Alex Williamson2a41f712009-02-04 09:02:34 +0000760
761 /*
762 * Spin for a response, the kick causes an ioport write, trapping
763 * into the hypervisor, so the request should be handled immediately.
764 */
Michael S. Tsirkin1915a712010-04-12 16:19:04 +0300765 while (!virtqueue_get_buf(vi->cvq, &tmp))
Alex Williamson2a41f712009-02-04 09:02:34 +0000766 cpu_relax();
767
768 return status == VIRTIO_NET_OK;
769}
770
Rusty Russell296f96f2007-10-22 11:03:37 +1000771static int virtnet_close(struct net_device *dev)
772{
773 struct virtnet_info *vi = netdev_priv(dev);
Rusty Russell296f96f2007-10-22 11:03:37 +1000774
775 napi_disable(&vi->napi);
776
Rusty Russell296f96f2007-10-22 11:03:37 +1000777 return 0;
778}
779
Alex Williamson2af76982009-02-04 09:02:40 +0000780static void virtnet_set_rx_mode(struct net_device *dev)
781{
782 struct virtnet_info *vi = netdev_priv(dev);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000783 struct scatterlist sg[2];
Alex Williamson2af76982009-02-04 09:02:40 +0000784 u8 promisc, allmulti;
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000785 struct virtio_net_ctrl_mac *mac_data;
Jiri Pirkoccffad22009-05-22 23:22:17 +0000786 struct netdev_hw_addr *ha;
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800787 int uc_count;
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000788 int mc_count;
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000789 void *buf;
790 int i;
Alex Williamson2af76982009-02-04 09:02:40 +0000791
792 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
793 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
794 return;
795
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000796 promisc = ((dev->flags & IFF_PROMISC) != 0);
797 allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
Alex Williamson2af76982009-02-04 09:02:40 +0000798
Alex Williamson23e258e2009-05-01 17:27:56 +0000799 sg_init_one(sg, &promisc, sizeof(promisc));
Alex Williamson2af76982009-02-04 09:02:40 +0000800
801 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
802 VIRTIO_NET_CTRL_RX_PROMISC,
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000803 sg, 1, 0))
Alex Williamson2af76982009-02-04 09:02:40 +0000804 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
805 promisc ? "en" : "dis");
806
Alex Williamson23e258e2009-05-01 17:27:56 +0000807 sg_init_one(sg, &allmulti, sizeof(allmulti));
Alex Williamson2af76982009-02-04 09:02:40 +0000808
809 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
810 VIRTIO_NET_CTRL_RX_ALLMULTI,
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000811 sg, 1, 0))
Alex Williamson2af76982009-02-04 09:02:40 +0000812 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
813 allmulti ? "en" : "dis");
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000814
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800815 uc_count = netdev_uc_count(dev);
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000816 mc_count = netdev_mc_count(dev);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000817 /* MAC filter - use one buffer for both lists */
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000818 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
819 (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
820 mac_data = buf;
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000821 if (!buf) {
822 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
823 return;
824 }
825
Alex Williamson23e258e2009-05-01 17:27:56 +0000826 sg_init_table(sg, 2);
827
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000828 /* Store the unicast list and count in the front of the buffer */
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800829 mac_data->entries = uc_count;
Jiri Pirkoccffad22009-05-22 23:22:17 +0000830 i = 0;
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800831 netdev_for_each_uc_addr(ha, dev)
Jiri Pirkoccffad22009-05-22 23:22:17 +0000832 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000833
834 sg_set_buf(&sg[0], mac_data,
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800835 sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000836
837 /* multicast list and count fill the end */
Jiri Pirko32e7bfc2010-01-25 13:36:10 -0800838 mac_data = (void *)&mac_data->macs[uc_count][0];
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000839
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000840 mac_data->entries = mc_count;
Jiri Pirko567ec872010-02-23 23:17:07 +0000841 i = 0;
Jiri Pirko22bedad2010-04-01 21:22:57 +0000842 netdev_for_each_mc_addr(ha, dev)
843 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000844
845 sg_set_buf(&sg[1], mac_data,
Jiri Pirko4cd24ea2010-02-08 04:30:35 +0000846 sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
Alex Williamsonf565a7c2009-02-04 09:02:45 +0000847
848 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
849 VIRTIO_NET_CTRL_MAC_TABLE_SET,
850 sg, 2, 0))
851 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
852
853 kfree(buf);
Alex Williamson2af76982009-02-04 09:02:40 +0000854}
855
Alex Williamson1824a982009-05-01 17:31:10 +0000856static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
Alex Williamson0bde95692009-02-04 09:02:50 +0000857{
858 struct virtnet_info *vi = netdev_priv(dev);
859 struct scatterlist sg;
860
Alex Williamson23e258e2009-05-01 17:27:56 +0000861 sg_init_one(&sg, &vid, sizeof(vid));
Alex Williamson0bde95692009-02-04 09:02:50 +0000862
863 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
864 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
865 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
866}
867
Alex Williamson1824a982009-05-01 17:31:10 +0000868static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
Alex Williamson0bde95692009-02-04 09:02:50 +0000869{
870 struct virtnet_info *vi = netdev_priv(dev);
871 struct scatterlist sg;
872
Alex Williamson23e258e2009-05-01 17:27:56 +0000873 sg_init_one(&sg, &vid, sizeof(vid));
Alex Williamson0bde95692009-02-04 09:02:50 +0000874
875 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
876 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
877 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
878}
879
Rick Jones8f9f4662011-10-19 08:10:59 +0000880static void virtnet_get_ringparam(struct net_device *dev,
881 struct ethtool_ringparam *ring)
882{
883 struct virtnet_info *vi = netdev_priv(dev);
884
885 ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
886 ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
887 ring->rx_pending = ring->rx_max_pending;
888 ring->tx_pending = ring->tx_max_pending;
889
890}
891
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700892static const struct ethtool_ops virtnet_ethtool_ops = {
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800893 .get_link = ethtool_op_get_link,
Rick Jones8f9f4662011-10-19 08:10:59 +0000894 .get_ringparam = virtnet_get_ringparam,
Herbert Xua9ea3fc2008-04-18 11:21:42 +0800895};
896
Mark McLoughlin39da5812008-11-26 13:58:11 +0000897#define MIN_MTU 68
898#define MAX_MTU 65535
899
900static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
901{
902 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
903 return -EINVAL;
904 dev->mtu = new_mtu;
905 return 0;
906}
907
Stephen Hemminger76288b42009-01-06 10:44:22 -0800908static const struct net_device_ops virtnet_netdev = {
909 .ndo_open = virtnet_open,
910 .ndo_stop = virtnet_close,
911 .ndo_start_xmit = start_xmit,
912 .ndo_validate_addr = eth_validate_addr,
Alex Williamson9c46f6d2009-02-04 16:36:34 -0800913 .ndo_set_mac_address = virtnet_set_mac_address,
Alex Williamson2af76982009-02-04 09:02:40 +0000914 .ndo_set_rx_mode = virtnet_set_rx_mode,
Stephen Hemminger76288b42009-01-06 10:44:22 -0800915 .ndo_change_mtu = virtnet_change_mtu,
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000916 .ndo_get_stats64 = virtnet_stats,
Alex Williamson1824a982009-05-01 17:31:10 +0000917 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
918 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
Stephen Hemminger76288b42009-01-06 10:44:22 -0800919#ifdef CONFIG_NET_POLL_CONTROLLER
920 .ndo_poll_controller = virtnet_netpoll,
921#endif
922};
923
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800924static void virtnet_update_status(struct virtnet_info *vi)
925{
926 u16 v;
927
Sasha Levin77dd7692011-08-14 17:52:33 +0300928 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800929 offsetof(struct virtio_net_config, status),
Sasha Levin77dd7692011-08-14 17:52:33 +0300930 &v) < 0)
931 return;
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -0800932
933 /* Ignore unknown (future) status bits */
934 v &= VIRTIO_NET_S_LINK_UP;
935
936 if (vi->status == v)
937 return;
938
939 vi->status = v;
940
941 if (vi->status & VIRTIO_NET_S_LINK_UP) {
942 netif_carrier_on(vi->dev);
943 netif_wake_queue(vi->dev);
944 } else {
945 netif_carrier_off(vi->dev);
946 netif_stop_queue(vi->dev);
947 }
948}
949
950static void virtnet_config_changed(struct virtio_device *vdev)
951{
952 struct virtnet_info *vi = vdev->priv;
953
954 virtnet_update_status(vi);
955}
956
Rusty Russell296f96f2007-10-22 11:03:37 +1000957static int virtnet_probe(struct virtio_device *vdev)
958{
959 int err;
Rusty Russell296f96f2007-10-22 11:03:37 +1000960 struct net_device *dev;
961 struct virtnet_info *vi;
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600962 struct virtqueue *vqs[3];
963 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
964 const char *names[] = { "input", "output", "control" };
965 int nvqs;
Rusty Russell296f96f2007-10-22 11:03:37 +1000966
967 /* Allocate ourselves a network device with room for our info */
968 dev = alloc_etherdev(sizeof(struct virtnet_info));
969 if (!dev)
970 return -ENOMEM;
971
972 /* Set up network device as normal. */
Jiri Pirko01789342011-08-16 06:29:00 +0000973 dev->priv_flags |= IFF_UNICAST_FLT;
Stephen Hemminger76288b42009-01-06 10:44:22 -0800974 dev->netdev_ops = &virtnet_netdev;
Rusty Russell296f96f2007-10-22 11:03:37 +1000975 dev->features = NETIF_F_HIGHDMA;
stephen hemminger3fa2a1d2011-06-15 06:36:29 +0000976
Herbert Xua9ea3fc2008-04-18 11:21:42 +0800977 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
Rusty Russell296f96f2007-10-22 11:03:37 +1000978 SET_NETDEV_DEV(dev, &vdev->dev);
979
980 /* Do we support "hardware" checksums? */
Michał Mirosław98e778c2011-03-31 01:01:35 +0000981 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
Rusty Russell296f96f2007-10-22 11:03:37 +1000982 /* This opens up the world of extra features. */
Michał Mirosław98e778c2011-03-31 01:01:35 +0000983 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
984 if (csum)
985 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
986
987 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
988 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
Rusty Russell34a48572008-02-04 23:50:02 -0500989 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
990 }
Rusty Russell5539ae92008-05-02 21:50:46 -0500991 /* Individual feature bits: what can host handle? */
Michał Mirosław98e778c2011-03-31 01:01:35 +0000992 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
993 dev->hw_features |= NETIF_F_TSO;
994 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
995 dev->hw_features |= NETIF_F_TSO6;
996 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
997 dev->hw_features |= NETIF_F_TSO_ECN;
998 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
999 dev->hw_features |= NETIF_F_UFO;
1000
1001 if (gso)
1002 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1003 /* (!csum && gso) case will be fixed by register_netdev() */
Rusty Russell296f96f2007-10-22 11:03:37 +10001004 }
1005
1006 /* Configuration may specify what MAC to use. Otherwise random. */
Sasha Levin77dd7692011-08-14 17:52:33 +03001007 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
Rusty Russella586d4f2008-02-04 23:49:56 -05001008 offsetof(struct virtio_net_config, mac),
Sasha Levin77dd7692011-08-14 17:52:33 +03001009 dev->dev_addr, dev->addr_len) < 0)
Rusty Russell296f96f2007-10-22 11:03:37 +10001010 random_ether_addr(dev->dev_addr);
1011
1012 /* Set up our device-specific information */
1013 vi = netdev_priv(dev);
Dor Laor6c0cd7c2007-12-16 15:19:43 +02001014 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
Rusty Russell296f96f2007-10-22 11:03:37 +10001015 vi->dev = dev;
1016 vi->vdev = vdev;
Christian Borntraegerd9d5dcc2008-02-18 10:02:51 +01001017 vdev->priv = vi;
Rusty Russellfb6813f2008-07-25 12:06:01 -05001018 vi->pages = NULL;
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001019 vi->stats = alloc_percpu(struct virtnet_stats);
1020 err = -ENOMEM;
1021 if (vi->stats == NULL)
1022 goto free;
1023
Rusty Russell3161e452009-08-26 12:22:32 -07001024 INIT_DELAYED_WORK(&vi->refill, refill_work);
Michael S. Tsirkin5e01d2f2010-04-07 21:01:41 -07001025 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1026 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
Rusty Russell296f96f2007-10-22 11:03:37 +10001027
Herbert Xu97402b92008-04-18 11:24:27 +08001028 /* If we can receive ANY GSO packets, we must allocate large ones. */
Joe Perches8e95a202009-12-03 07:58:21 +00001029 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1030 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1031 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
Herbert Xu97402b92008-04-18 11:24:27 +08001032 vi->big_packets = true;
1033
Mark McLoughlin3f2c31d2008-11-16 22:41:34 -08001034 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1035 vi->mergeable_rx_bufs = true;
1036
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001037 /* We expect two virtqueues, receive then send,
1038 * and optionally control. */
1039 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
Rusty Russell296f96f2007-10-22 11:03:37 +10001040
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001041 err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
1042 if (err)
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001043 goto free_stats;
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001044
1045 vi->rvq = vqs[0];
1046 vi->svq = vqs[1];
Rusty Russell296f96f2007-10-22 11:03:37 +10001047
Alex Williamson2a41f712009-02-04 09:02:34 +00001048 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001049 vi->cvq = vqs[2];
Alex Williamson0bde95692009-02-04 09:02:50 +00001050
1051 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1052 dev->features |= NETIF_F_HW_VLAN_FILTER;
Alex Williamson2a41f712009-02-04 09:02:34 +00001053 }
1054
Rusty Russell296f96f2007-10-22 11:03:37 +10001055 err = register_netdev(dev);
1056 if (err) {
1057 pr_debug("virtio_net: registering device failed\n");
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001058 goto free_vqs;
Rusty Russell296f96f2007-10-22 11:03:37 +10001059 }
Rusty Russellb3369c12008-02-04 23:50:02 -05001060
1061 /* Last of all, set up some receive buffers. */
Rusty Russell3161e452009-08-26 12:22:32 -07001062 try_fill_recv(vi, GFP_KERNEL);
Rusty Russellb3369c12008-02-04 23:50:02 -05001063
1064 /* If we didn't even get one input buffer, we're useless. */
1065 if (vi->num == 0) {
1066 err = -ENOMEM;
1067 goto unregister;
1068 }
1069
Jason Wang167c25e2010-11-10 14:45:41 +00001070 /* Assume link up if device can't report link status,
1071 otherwise get link status from config. */
1072 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1073 netif_carrier_off(dev);
1074 virtnet_update_status(vi);
1075 } else {
1076 vi->status = VIRTIO_NET_S_LINK_UP;
1077 netif_carrier_on(dev);
1078 }
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -08001079
Rusty Russell296f96f2007-10-22 11:03:37 +10001080 pr_debug("virtnet: registered device %s\n", dev->name);
Rusty Russell296f96f2007-10-22 11:03:37 +10001081 return 0;
1082
Rusty Russellb3369c12008-02-04 23:50:02 -05001083unregister:
1084 unregister_netdev(dev);
Rusty Russell3161e452009-08-26 12:22:32 -07001085 cancel_delayed_work_sync(&vi->refill);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001086free_vqs:
1087 vdev->config->del_vqs(vdev);
stephen hemminger3fa2a1d2011-06-15 06:36:29 +00001088free_stats:
1089 free_percpu(vi->stats);
Rusty Russell296f96f2007-10-22 11:03:37 +10001090free:
1091 free_netdev(dev);
1092 return err;
1093}
1094
Shirley Ma9ab86bb2010-01-29 03:20:04 +00001095static void free_unused_bufs(struct virtnet_info *vi)
1096{
1097 void *buf;
1098 while (1) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +03001099 buf = virtqueue_detach_unused_buf(vi->svq);
Shirley Ma830a8a92010-02-08 14:14:42 +00001100 if (!buf)
1101 break;
1102 dev_kfree_skb(buf);
1103 }
1104 while (1) {
Michael S. Tsirkin1915a712010-04-12 16:19:04 +03001105 buf = virtqueue_detach_unused_buf(vi->rvq);
Shirley Ma9ab86bb2010-01-29 03:20:04 +00001106 if (!buf)
1107 break;
1108 if (vi->mergeable_rx_bufs || vi->big_packets)
1109 give_pages(vi, buf);
1110 else
1111 dev_kfree_skb(buf);
1112 --vi->num;
1113 }
1114 BUG_ON(vi->num != 0);
1115}
1116
Uwe Kleine-König3d1285b2009-09-30 22:28:34 +00001117static void __devexit virtnet_remove(struct virtio_device *vdev)
Rusty Russell296f96f2007-10-22 11:03:37 +10001118{
Rusty Russell74b25532007-11-19 11:20:42 -05001119 struct virtnet_info *vi = vdev->priv;
Rusty Russellb3369c12008-02-04 23:50:02 -05001120
Rusty Russell6e5aa7e2008-02-04 23:50:03 -05001121 /* Stop all the virtqueues. */
1122 vdev->config->reset(vdev);
1123
Rusty Russellb3369c12008-02-04 23:50:02 -05001124
Rusty Russell74b25532007-11-19 11:20:42 -05001125 unregister_netdev(vi->dev);
Rusty Russell3161e452009-08-26 12:22:32 -07001126 cancel_delayed_work_sync(&vi->refill);
Shirley Ma830a8a92010-02-08 14:14:42 +00001127
1128 /* Free unused buffers in both send and recv, if any. */
Shirley Ma9ab86bb2010-01-29 03:20:04 +00001129 free_unused_bufs(vi);
Rusty Russellfb6813f2008-07-25 12:06:01 -05001130
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -06001131 vdev->config->del_vqs(vi->vdev);
1132
Rusty Russellfb6813f2008-07-25 12:06:01 -05001133 while (vi->pages)
1134 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1135
Krishna Kumar2e66f552011-07-20 03:56:02 +00001136 free_percpu(vi->stats);
Rusty Russell74b25532007-11-19 11:20:42 -05001137 free_netdev(vi->dev);
Rusty Russell296f96f2007-10-22 11:03:37 +10001138}
1139
1140static struct virtio_device_id id_table[] = {
1141 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1142 { 0 },
1143};
1144
Rusty Russellc45a6812008-05-02 21:50:50 -05001145static unsigned int features[] = {
Mark McLoughlin5e4fe5c2008-07-08 17:10:42 +10001146 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1147 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
Rusty Russellc45a6812008-05-02 21:50:50 -05001148 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
Herbert Xu97402b92008-04-18 11:24:27 +08001149 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
Sridhar Samudrala5c516752009-07-14 14:21:02 +00001150 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
Alex Williamson2a41f712009-02-04 09:02:34 +00001151 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
Alex Williamson0bde95692009-02-04 09:02:50 +00001152 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
Rusty Russellc45a6812008-05-02 21:50:50 -05001153};
1154
Uwe Kleine-König22402522009-11-05 01:32:44 -08001155static struct virtio_driver virtio_net_driver = {
Rusty Russellc45a6812008-05-02 21:50:50 -05001156 .feature_table = features,
1157 .feature_table_size = ARRAY_SIZE(features),
Rusty Russell296f96f2007-10-22 11:03:37 +10001158 .driver.name = KBUILD_MODNAME,
1159 .driver.owner = THIS_MODULE,
1160 .id_table = id_table,
1161 .probe = virtnet_probe,
1162 .remove = __devexit_p(virtnet_remove),
Mark McLoughlin9f4d26d2009-01-19 17:09:49 -08001163 .config_changed = virtnet_config_changed,
Rusty Russell296f96f2007-10-22 11:03:37 +10001164};
1165
1166static int __init init(void)
1167{
Uwe Kleine-König22402522009-11-05 01:32:44 -08001168 return register_virtio_driver(&virtio_net_driver);
Rusty Russell296f96f2007-10-22 11:03:37 +10001169}
1170
1171static void __exit fini(void)
1172{
Uwe Kleine-König22402522009-11-05 01:32:44 -08001173 unregister_virtio_driver(&virtio_net_driver);
Rusty Russell296f96f2007-10-22 11:03:37 +10001174}
1175module_init(init);
1176module_exit(fini);
1177
1178MODULE_DEVICE_TABLE(virtio, id_table);
1179MODULE_DESCRIPTION("Virtio network driver");
1180MODULE_LICENSE("GPL");